I have a Dell 4700 that had a dual drive with dvd-rom on top and a cd-rw drive below it. Yesterday I swapped out the cd-rw drive for a Pioneer dvd-rw model 110. My problem is that BIOS does not see it and I get stopped at start-up by BIOS. If I F1 and continue its fine and windows definitely recognizes and identifies the drive. I updated the BIOS to the most current as well as flashed the new Pioneer drive with no luck. Any ideas why the BIOS don't see the new drive?